EP3791751B1 - Procédé de fixation d'une brosse dans un porte-brosse ainsi que dispositif correspondant - Google Patents

Procédé de fixation d'une brosse dans un porte-brosse ainsi que dispositif correspondant Download PDF

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Publication number
EP3791751B1
EP3791751B1 EP20193911.3A EP20193911A EP3791751B1 EP 3791751 B1 EP3791751 B1 EP 3791751B1 EP 20193911 A EP20193911 A EP 20193911A EP 3791751 B1 EP3791751 B1 EP 3791751B1
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EP
European Patent Office
Prior art keywords
bristle
opening
sonotrode
front side
bristle carrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP20193911.3A
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German (de)
English (en)
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EP3791751A1 (fr
Inventor
Bart Gerard Boucherie
Chris DEPICKERE
Henk Vandenbussche
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GB Boucherie NV
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GB Boucherie NV
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Publication of EP3791751A1 publication Critical patent/EP3791751A1/fr
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Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D3/00—Preparing, i.e. Manufacturing brush bodies
    • A46D3/04—Machines for inserting or fixing bristles in bodies
    • A46D3/045—Machines for inserting or fixing bristles in bodies for fixing bristles by fusing or gluing to a body
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B3/00—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier
    • A46B3/06—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier by welding together bristles made of metal wires or plastic materials
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D3/00—Preparing, i.e. Manufacturing brush bodies
    • A46D3/08—Parts of brush-making machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/567—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits using a tamping or a swaging operation, i.e. at least partially deforming the edge or the rim of a first part to be joined to clamp a second part to be joined
    • B29C65/568—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits using a tamping or a swaging operation, i.e. at least partially deforming the edge or the rim of a first part to be joined to clamp a second part to be joined using a swaging operation, i.e. totally deforming the edge or the rim of a first part to be joined to clamp a second part to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/60—Riveting or staking
    • B29C65/606—Riveting or staking the rivets being integral with one of the parts to be joined, i.e. staking
    • B29C65/608—Riveting or staking the rivets being integral with one of the parts to be joined, i.e. staking the integral rivets being pushed in blind holes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/303—Particular design of joint configurations the joint involving an anchoring effect
    • B29C66/3032—Particular design of joint configurations the joint involving an anchoring effect making use of protrusions or cavities belonging to at least one of the parts to be joined
    • B29C66/30325—Particular design of joint configurations the joint involving an anchoring effect making use of protrusions or cavities belonging to at least one of the parts to be joined making use of cavities belonging to at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/69—General aspects of joining filaments 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D3/00—Preparing, i.e. Manufacturing brush bodies
    • A46D3/06—Machines for both drilling bodies and inserting bristles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/42—Brushes
    • B29L2031/425—Toothbrush

Definitions

  • the invention relates to a method for fastening at least one bristle in an associated opening in a bristle carrier made of plastic, which has a front side, wherein the at least one bristle has a thickened fastening end.
  • the bristle carrier is part of this brush and not a pure tool.
  • the invention relates to a device for carrying out the method according to the invention.
  • Brushes can be manufactured in a variety of ways.
  • the traditional method is to fold bundles of bristles and fix them at the fold point using an anchor in the opening of a bristle carrier. This is the so-called anchor fastening method.
  • a first method consists in the bristle carrier being injected around a thickened fastening end of the unfolded bundle, so that the bristle carrier is only manufactured later, and is combined with the bristle bundle during its manufacture.
  • Yet another method involves heating the bristle ends together to produce the thickened attachment end so that they melt and are combined into a lump or ball-like thickened attachment end.
  • the bristle bundle With this thickened attachment end in front, the bristle bundle is then pushed into an opening in a bristle carrier, the wall around the opening being melted before being pushed in.
  • the thickened attachment end then pierces the wall to plastically deform it.
  • Another solution that has caused a revolution on the market in recent years is to insert the solidified, thickened fastening end into an oversized opening in the bristle carrier and then heat the peripheral edge around the opening to a temperature that is below the melting temperature. The heated peripheral edge is then subjected to pressure from the outside so that the opening narrows at the mouth edge. This secures the thickened fastening end against being pulled out.
  • the tool that exerts the mechanical pressure on the front of the bristle carrier is preferably the magazine with which the bundle of bristles is transported. The magazine therefore has a multiple function and must be designed to be heatable. In particular, an electric heater is used here.
  • the EN 10 017 122 876 A1 called.
  • the EP 2 528 472 A1 describes the use of a sonotrode to weld a bristle carrier plate to a toothbrush body. To do this, the material of the bristle carrier plate and the toothbrush body is melted in the welding zone with the sonotrode and a material bond is created between the bristle carrier plate and the toothbrush body.
  • the object of the invention is to further improve and simplify the last-mentioned method, in which the bristle bundle is inserted into an opening and the edge of the opening is subsequently heated.
  • the method according to the invention is characterized by the following steps:
  • the at least one bristle preferably the entire bundle of bristles, is inserted with its thickened fastening end first from the front into the opening so far that the thickened fastening end sits completely in the opening and is spaced from the front. This means that the non-thickened part of the bristle or bundle of bristles immediately adjacent to the thickened fastening end also sits in the opening.
  • a sonotrode is placed on the front side around an opening edge that surrounds the opening on the front side. This means that the sonotrode contacts the bristle carrier in the area of the opening edge.
  • the sonotrode is activated and, through its vibration energy and pressure on the front of the bristle carrier, heats the plastic in the bristle carrier below the opening edge.
  • the sonotrode therefore does not have to bring the entire bristle carrier to a higher temperature, but only the part of the wall bordering the opening that lies below the front and the opening edge.
  • the sonotrode does not have to be activated until it has already contacted the opening edge, but can be moved against the opening edge while it is already vibrating.
  • the activated sonotrode is pressed against the opening edge at the front during oscillation and this pressure process deforms the locally heated bristle carrier below the opening edge. This reduces the cross-section of the opening in the area of the opening edge to a new, smaller cross-section that is smaller than the thickened fastening end in order to mechanically lock this fastening end in the bristle carrier.
  • the opening is therefore constricted in the area of its mouth, which is located at the transition to the front opening edge, and the fastening end, which could be loosely inserted into the opening, becomes an integrated anchor.
  • the first contact of the front side by the sonotrode, the activation of the sonotrode and the feeding into the bristle carrier can take place simultaneously or slightly staggered in time.
  • the movement into the bristle carrier can also optionally be controlled by distance and/or force and/or time.
  • the ultrasonic vibration of the sonotrode is maintained during the forming process. It heats a minimal area below its face and deforms it, pressing itself into the material, heats further material as it continues to vibrate, pressing itself even deeper to deform even more plastic, and so on, until the desired axial travel distance is reached.
  • the plastic can never be heated significantly above its melting temperature and therefore can never be thermally damaged.
  • the thermoplastic material is preferably selected from the group consisting of polyester, in particular polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polypropylene (PP), polycarbonate (PC), polyamide (PA), polyvinyl acetate (PVA), polyethylene (PE), acrylonitrile-butadiene-styrene copolymer (ABS) and styrene-acrylonitrile copolymer (SAN). Both homopolymers and copolymers with the thermoplastic materials mentioned can be used.
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PP polypropylene
  • PC polycarbonate
  • PA polyamide
  • PVA polyvinyl acetate
  • PE polyethylene
  • ABS acrylonitrile-butadiene-styrene copolymer
  • SAN styrene-acrylonitrile copolymer
  • the cross-section of the opening is large enough that the thickened fastening end can be inserted into the opening without resistance, i.e. without a press fit occurring between the opening and the fastening end.
  • a sonotrode that runs completely or only partially around the opening can be used as a sonotrode, so that in other words the contact surface of the sonotrode is either a closed ring or only forms ring sections.
  • the sonotrode only runs partially around the opening, in a variant of the invention it can be slotted long and consist of several bowl-shaped sonotrode sections.
  • these sonotrode sections can be moved closer or closer together in order to make a receptacle formed between them for the at least one bristle, in particular the bristle bundle, variable in terms of cross-section.
  • the sonotrode can form a holding unit in order to receive and hold the at least one bristle, preferably the bristle bundle, between them.
  • the at least one bristle in particular the bristle bundle, can be made of thermoplastic material.
  • the thickened fastening end is formed by melting one end of the bristle, or in the case of a bristle bundle, by fusing the ends of the bristles of the bristle bundle. This heating can preferably be carried out without contact, for example via radiant heating or hot air.
  • the thickened fastening end of a bristle bundle which is inserted into the associated opening and anchored by the sonotrode by reshaping the plastic, can be created before or after the bristle bundle is inserted into the sonotrode.
  • the bristle ends are therefore either fused together before being inserted into the sonotrode or after they are inserted into the sonotrode holder. The same applies to a single bristle that is inserted into an opening alone.
  • the sonotrode can have a receptacle for the at least one bristle, in particular the bristle bundle, and the sonotrode transports these to the bristle carrier.
  • the at least one bristle, preferably the bristle bundle, is pushed from the receptacle of the sonotrode into the opening in the bristle carrier.
  • the sonotrode therefore has a multiple function, namely a transport function, a heating function and a forming function.
  • an additional slider can be inserted to ensure that the fastening end rests against the base of the opening, which is preferably a blind hole.
  • the slider can, for example, penetrate into the recess in the sonotrode or is guided in it.
  • the bristle end when inserting the at least one bristle into the opening, can be at ambient temperature, i.e. not heated and/or the bristle carrier in the area of the opening edge and the opening also not heated and thus at ambient temperature.
  • the heating is achieved exclusively by the sonotrode.
  • the sonotrode can also accommodate several bundles of bristles and anchor them simultaneously in assigned openings in the same bristle carrier by heating and reshaping the plastic.
  • the sonotrode can have a flat front side, which is not to be understood as restrictive, which rests completely on the front side of the bristle carrier and heats it over a large area.
  • the shared sonotrode only has island-shaped contact surfaces with the bristle carrier, i.e. contact surfaces around the respective opening edge and thus several island-shaped contact surfaces. Only these contact surfaces are then heated.
  • the sonotrode does not have to and should not heat the plastic of the bristle carrier completely over its entire height or thickness; it is completely sufficient that only an upper area of the plastic bordering the opening, close to the front, is heated and reshaped. In the area of the base of the opening, i.e. in the area of the thickened fastening end, no heating or reshaping needs to be carried out. However, this is not to be understood as restrictive.
  • the plastic can be reshaped and the opening narrowed so that the reshaped plastic fits tightly/sealingly on the outer circumference of the bristle bundle or at least one bristle, preferably right in the area of the mouth (transition from opening to front) of the opening.
  • This is not only important to ensure that the thickened end of the bristle bundle no longer slips out of the opening when the brush is used and the brush is therefore subjected to mechanical stress, but also that no water or "impurities" can penetrate into the openings.
  • the latter is particularly important for so-called “hygiene brushes” that are used in, for example, butcher shops, the food industry, the pharmaceutical industry, etc., where bacteria and fungal organisms must be prevented from nesting in the openings.
  • the narrowing of the openings on the outer circumference creates a kind of seal around the bristle bundle that fits on at least one bristle on the bristle bundle at a distance from the thickened end of the bristle.
  • a device for carrying out the method according to the invention with a holder for receiving bristle carriers with at least one opening in the bristle carrier, a feed tool for the at least one bristle, in particular the bristle bundle, which is inserted into the opening, and a sonotrode receiving the at least one bristle, which is guided so as to be movable in the direction of the front side of the bristle carrier and away from the front side, wherein the sonotrode is designed such that it can heat the plastic below the edge of the opening.
  • the sonotrode can also form part of the feed tool and have at least one receptacle for the at least one bristle, which means automatically for the bristle bundle if a bristle bundle is present, with at least one slider being provided which pushes the at least one bristle/bristle bundle from an associated recess into the associated opening after being transported to the bristle carrier. If several recesses are provided for spaced bristles or bristle bundles, the recesses have the hole pattern that is also provided in the bristle carrier. This means that the bristles/bristle bundles can optionally be pushed into their openings simultaneously or at most slightly staggered using corresponding sliders.
  • the cross-section of the recess is adapted to the shape of the associated opening, but preferably has a smaller cross-section than the opening in the non-deformed state of this opening. This ensures that the sonotrode always rests on the edge of the opening at the front and does not first contact the edge of the opening in a radially laterally offset manner. This would result in a less heated opening edge in the area of the mouth. In this area, however, it is advantageous if there is sufficient heat to press the material inwards.
  • a sonotrode that also serves as a pressing tool and extends over the opening and does not end at the edge of the opening also means that the plastic material deformed inwards is still a shape limitation by the front side of the sonotrode. This means that the surface of the bristle carrier in the area of the opening edge becomes very smooth after forming.
  • the sonotrode can already oscillate in the ultrasonic range before it touches the outside of the brush body, so that vibration energy can be transferred immediately upon first contact and when pressure begins to build up.
  • the sonotrode is usually brought against the brush body first and only switched on to oscillate once a certain minimum pressure has been reached.
  • Duration, pressure, delivery, power, start and end of the vibration energy transfer can be freely adjusted with modern ultrasound devices, both individually and dependently on one another in freely programmable cycles. Pulsating cycles are also conceivable. In most cases, it is determined empirically which parameters in which combination produce the best result for which application.
  • a bristle carrier 10 is shown, which is part of a finished brush.
  • the bristle carrier 10 consists of a thermoplastic material and has numerous openings 12 into which a bristle or several bristles, i.e. also a bristle bundle 14 (see Figure 2 ) and anchored in the bristle carrier 10.
  • the subsequent brush can be any type of brush, be it a household brush, a toothbrush or the like.
  • the bristle carrier 10 can also be the entire brush carrier or a part of the brush carrier, for example a plate later fitted with bundles of bristles, which is combined with the rest of the bristle body, for example by overmolding, welding, gluing or the like.
  • the openings 12 in the bristle carrier 10 are either produced by drilling, as symbolically shown by the drilling tool 16, or during injection molding of the bristle carrier 10.
  • the openings 12 are in particular blind holes.
  • openings 12 are cylindrical down to the bottom, i.e. they have no undercuts or the like, see Figure 3 .
  • the opening begins from a front side 18 of the bristle carrier 10, and the mouth of the opening, i.e. the transition from the opening 12 to the front side 18, is surrounded by an opening edge 20 which runs in a ring around the opening 12 on the front side 18.
  • the opening 12 itself is defined by an inner side 22 of the wall delimiting the opening 12.
  • the opening 12 runs at right angles to the front side 18, but it can also run at an angle to it.
  • At least one bristle or a bundle of bristles 14 is inserted into the respective opening 12 and fastened therein, wherein the at least one bristle or the bundle of bristles has a thickened fastening end 24.
  • This thickened fastening end 24 is produced by heating and melting the singular bristle or bristles of the bristle bundle together to form a plug or a kind of ball of plastic material which is thicker in cross-section than the singular bristle or, when a bristle bundle 14 is inserted into the bristle carrier 10, thicker than the cross-section of the bristle bundle 14.
  • the thickened fastening end is the common fastening end of all the bristles of the bristle bundle 14 because the melted plastic of the bristle ends merges into one another so that the bristles of a bristle bundle 14 are connected to one another.
  • the singular bristle or the bristle bundle 14 is guided by a sonotrode 26 (see Figure 2 ) in the bristle carrier 10, without anchoring. This is explained below using the Figures 2 to 5 and an embodiment are described.
  • the sonotrode 26 has a receptacle 28 in the form of a central channel.
  • a bristle bundle 14 with a thickened fastening end 24 is inserted from the front (this is not to be understood as limiting) into the receptacle 28 so that, as in Figure 2 shown, the fastening end 24 protrudes from the front of the sonotrode 26.
  • the sonotrode 26 which sits on a displaceable and movable tool holder, is moved to the associated opening 12 into which the bristle bundle 14 is to be inserted.
  • the sonotrode 26 is preferably placed on the front side 18 so that the fastening end 24 protruding beyond the sonotrode 26 is inserted into the opening 12.
  • the fastening end 24 will rest against the bottom 29 of the opening 12.
  • the cross-section of the opening 12 is adapted to the cross-section (perpendicular to the longitudinal extension of the bristle or the bristle bundle 14) so that it is at least as large, preferably slightly larger than the cross-section of the thickened fastening end 24. This allows the fastening end 24 to be inserted into the opening 12 without clamping or friction.
  • the thickened fastening end 24 does not protrude outwards from the front side 18, but quite the opposite, it lies below the front side 18 at a certain distance s from the front side 18. This means that the bristles of the bristle bundle 14 then run over the distance s in the opening 12.
  • the sonotrode 26 has a front side 30 with which it preferably rests completely on the front side 18.
  • the front side 30 can be flat.
  • the cross-section of the receptacle 28 is smaller than the cross-section of the opening 12, so that the front side 30 partially covers the opening 12 to the front side 18.
  • the cross-section of the receptacle 28 can be minimally larger than the cross-section of the bristle bundle 14 or also minimally smaller, in which case either the bristle bundle 14 is introduced into the receptacle 28 via a funnel-shaped insertion aid or the receptacle 28 has a funnel-shaped widening in the region of the front side 30 to facilitate the insertion of the bristle bundle 14.
  • sonotrode 26 is slotted lengthwise, similar to the clamping jaws of a drill chuck, and consists of several shell-shaped sections, whereby the inner sides of the shells then complement each other to form the holder 28.
  • These individual jaws, which are thus created, can then be moved laterally away from each other so that the holder 28 is enlarged and the bristle bundle 14 or the individual bristle can be inserted more easily into the can be inserted into the holder 28 or can also be transported into the holder 28 from the back.
  • the bristle carrier 10 is firmly held in a holder 32 of the corresponding device
  • the insertion of the bristle or the bundle of bristles 14 into the opening 12 can be assisted by a slider 34, see Figure 3 , which can penetrate into the receptacle 28 and presses the bristle bundle 14 to the bottom 29 of the opening 12.
  • the sonotrode 26 is pressed against the front side 18 and the vibration energy transfer to the bristle carrier begins.
  • the sonotrode 26 is now pressed further in the direction of the longitudinal extension of the bristles of the bristle bundle 14 against the front side 18, so that the heated plastic material below the opening edge is plastically deformed inwards (see Figure 4 ) and the opening 12 narrows above the thickened fastening end 24 and has a cross-section which is significantly smaller than that of the thickened fastening end 24.
  • the constriction 36 serves to hold the bristle bundle 14 in a form-fitting manner in the opening 12.
  • This heating and forming process takes place in a similar way to a hot knife that presses itself into butter, so to speak, in a flowing manner, because the sonotrode only heats a little plastic underneath it, can press into it a little due to the decreasing stability, heats deeper plastic material, forms it, etc., in order to finally stop the movement at the desired depth.
  • the plastic deformation of the plastic in the region of the constriction 36 can go so far that the constriction 36 contacts the bristle bundle 14 above the fastening end 24 circumferentially.
  • the sonotrode 26 After a certain exposure time, during which the lowest position of the sonotrode 26 relative to the bristle carrier 10 remains unchanged and the sonotrode preferably no longer oscillates, the sonotrode 26 is moved in the opposite direction to the arrow in Figure 4 axially again. The bristle bundle 14 is then Figure 5 firmly embedded in the bristle carrier 10.
  • the bristle carrier 10 By applying pressure to the heated front side 18 of the bristle carrier 10, a depression 38 can be created.
  • the bristle carrier 10 can have a raised area in the area of the opening edge 20, which then partially or completely disappears as a result of the forming process.
  • the sonotrode 26 has an opening which forms the recess 28, it completely encloses the opening 12; if the sonotrode 26 is slotted lengthwise and consists of individual jaws, it runs partially around the opening 12 on the front side 18.
  • the holder 32 can also be provided with a cooling device to ensure that the plastic is heated only in the area of the opening edge, i.e. only slightly below the front side 18.
  • the plastic of the opening 12 is heated exclusively by the sonotrode 26, that is, when the thickened fastening end 24 is inserted into the opening 12, the bristle carrier 10 is not heated in this area, but has ambient temperature.
  • the thickened fastening end 24 is completely solidified and not heated when inserted into the opening 12.
  • the thickened fastening end 24 can still have a certain temperature that is higher than the ambient temperature, so that when inserted into the opening 12 it adapts to the shape of the base 29 and the inner side 22 of the opening 12.
  • the device is designed such that the fastening end 24 is formed before the bristle bundle 14 is inserted into the sonotrode 26.
  • the bristle bundle or, if only a single bristle is used this can first be placed in the receptacle 28, then the fastening end 24 protruding from the sonotrode 26 is heated, for example by hot air or radiant heat, so that the plug-shaped or spherical fastening end 24 is formed.
  • the fastening end 24 is then hardened using cooling air, for example, and brought to ambient temperature before it is pushed into the associated opening 12. Cooling in general, however, is only an option.
  • FIG. 6 shows another option of the present invention, here a bristle bundle 14 is always removed from a bristle magazine 42 via a rotating separating device 44. The fastening end is then melted by a symbolically represented heating device 46 to form the thickening.
  • the bristle bundle 14 is then removed from the separating device 44 and transported to the sonotrode 26.
  • the sonotrode 26 takes the bristle bundle 14 from the separating device 44.
  • the openings 12 are equipped one after the other, namely by means of a sonotrode 26 one after the other.
  • the holder 32 with the brush body performs a positioning movement after each bundle fastening cycle in order to position the next hole opposite the sonotrode 26 (a so-called hole-to-hole movement), in order to then be able to start the next fastening cycle.
  • the sonotrode 26 can position itself opposite a stationary brush body holder 32 or both holder 32 and sonotrode 26 can each carry out part of the necessary positioning.
  • sonotrodes 26 can also work in parallel.
  • FIG. 7 shows a further embodiment of the invention in which a sonotrode 26 has more than one receptacle 28 for a bristle or a bundle of bristles 14.
  • the sonotrode 26 can pick up two, three, four, five, six or even more individual bristles or bristle bundles 14 or all bristles or bristle bundles of a brush and simultaneously transport them into associated openings 12 and then anchor them there.
  • the entire front side 30 can either be designed without a step and be flat or with a slight, desired curvature, which then has the later shape of the front side 18 of the brush.
  • Figure 7 shown that around each receptacle 28, the front side 30 protrudes slightly from the rest of the underside of the sonotrode 26, so that, for example, a type of ring cone is formed, whereby the shape of this protrusion is not necessarily restricted to a ring cone.
  • a type of ring cone is formed, whereby the shape of this protrusion is not necessarily restricted to a ring cone.
  • Figure 8 shows that the openings 12 can have different shapes, even arbitrary shapes.
  • the receptacles 28 have complementary shapes to these, for example, the receptacles 28 are circular if the opening 12 is circular, they only have a slightly smaller cross-section, as previously explained. The same applies to the other, arbitrary shapes.
  • the geometry of the receptacles 28 is preferably adapted to the geometry of the openings 12, based on the cross sections.
  • a sonotrode can have 26 holders of 28 different geometries and sizes.
  • a feeding tool can also be provided, with which the single bristle or the multiple single bristles or the bristle bundle 14 or the multiple bristle bundles 14 are first transported to the bristle carrier 10 and moved into the associated openings 12. Only then are one or more sonotrodes 26 moved in, which then cause the plastic to heat up and ensure the plastic deformation of the bristle carrier in the region of the opening edge(s) 20.
  • the receptacle 28 is slightly larger than the associated bristle bundle or the bristle to be installed singly, in such a way that the sonotrode does not move the individual bristles or the individual bristle when it oscillates.
  • the bristles are positioned by a separate holding device.
  • this does not necessarily have to be the case, because as previously described, a certain minimal movement of the bristles can also take place through the sonotrode when it oscillates, but this is so minimal that it does not result in incorrect positioning of the bristle or the bristle bundle after the plastic has been formed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Brushes (AREA)

Claims (15)

  1. Procédé de fixation d'au moins un poils dans une ouverture associée (12) dans un support de poils (10) en matière plastique en tant que partie d'une brosse ultérieure présentant une face avant (18), ledit au moins poil présentant une extrémité de fixation épaissie (24), caractérisé par les étapes suivantes :
    ledit au moins un poil est inséré dans l'ouverture (12) avec son extrémité de fixation épaissie (24) en avant depuis la face avant (18) jusqu'à ce que l'extrémité de fixation épaissie (24) soit entièrement logée dans l'ouverture (12) et espacée de la face avant (18),
    une sonotrode (26) est placée sur la face avant (18) autour d'un bord d'ouverture (20) entourant l'ouverture (12) sur la face avant (18),
    la sonotrode (26) est activée et génère, en raison de son énergie vibratoire et du contact avec le support de poils (10), un échauffement de la matière plastique dans le support de poils (10) au-dessous du bord d'ouverture (20), et
    la sonotrode est pressée sur la face avant (18) contre le bord d'ouverture (20) et déforme le support de poils (10) chauffé au-dessous du bord d'ouverture (20) et réduit la section transversale de l'ouverture (12) dans la zone du bord d'ouverture (20) à une section transversale inférieure à l'extrémité de fixation épaissie (24) pour bloquer l'extrémité de fixation (24) de manière mécanique dans le support de poils (10).
  2. Procédé selon la revendication 1, caractérisé en ce qu'une sonotrode (26) est utilisée, laquelle entoure entièrement ou partiellement l'ouverture (12).
  3. Procédé selon la revendication 2, caractérisé en ce que la sonotrode (26) est fendue longitudinalement et est composée d'une pluralité de tronçons de sonotrode en forme de coque.
  4. Procédé selon la revendication 3, caractérisé en ce que les tronçons de sonotrode forment ensemble une unité de retenue pour recevoir et retenir ledit au moins un poil entre eux.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que ledit au moins un poil est en matière plastique et en ce que l'extrémité de fixation épaissie (24) est réalisée par fusion d'une extrémité du poil.
  6. Procédé selon la revendication 5, caractérisé en ce que la touffe de poils (14) présente une extrémité de fixation épaissie (24) commune qui est réalisée par fusion des extrémités de poils adjacentes de la touffe de poils (14) avant ou après l'insertion dans la sonotrode (26).
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que la sonotrode (26) et le support de poils (10) réalisent un mouvement de positionnement l'une par rapport à l'autre par cycle de fixation.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que la sonotrode (26) présente un logement pour ledit au moins un poils et en ce que ledit au moins un poil est transporté vers le support de poils (10) et est poussé hors du logement dans l'ouverture (12) dans le support de poils (10).
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que lors de l'insertion dudit au moins un poil dans l'ouverture (12), l'extrémité de fixation (24) et/ou le support de poils (10) ne sont pas chauffés/n'est pas chauffé(e) dans la zone du bord d'ouverture (20) et de l'ouverture (12).
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce que la sonotrode (26) reçoit une pluralité de touffes de poils (14) et les ancre simultanément dans des ouvertures associées (12) dans le même support de poils (10) par chauffage et formage de la matière plastique.
  11. Procédé selon l'une des revendications précédentes, caractérisé en qu'uniquement une zone supérieure proche de la face avant (18) de la matière plastique délimitant l'ouverture (12) est formée.
  12. Procédé selon l'une des revendications précédentes, caractérisé en ce que la matière plastique est formée et l'ouverture (12) est rétrécie de telle sorte que la matière plastique formée repose sur ledit au moins un, repose en particulier de préférence de manière étanche sur la périphérie extérieure d'une touffe de poils (14).
  13. Dispositif pour la mise en oeuvre du procédé selon l'une des revendications précédentes, comprenant une attache (32) pour la réception de supports de poils (10) présentant au moins une ouverture (12), un outil d'amenée pour ledit au moins un poil inséré dans l'ouverture (12), et une sonotrode (26) qui reçoit au moins un poil et qui est guidée pour un mouvement en direction de la face avant (18) et en éloignement de celle-ci, la sonotrode (26) étant réalisée de manière à être apte à chauffer et à plastiquement former la matière plastique au-dessous du bord d'ouverture.
  14. Dispositif selon la revendication 13, caractérisé en ce que la sonotrode (26) fait également partie de l'outil d'amenée et présente au moins un logement (28) pour au moins un poil, au moins un coulisseau (34) étant prévu, qui, après le transport vers le support de poils (10), pousse ledit au moins un poil hors d'un logement associé (28) et dans l'ouverture (12).
  15. Dispositif selon la revendication 13 ou 14, caractérisé en ce que le logement (28) est adapté, en section transversale, à la forme de l'ouverture associée (12) et présente une section transversale inférieure à l'ouverture (12) à l'état non-déformé.
EP20193911.3A 2019-09-10 2020-09-01 Procédé de fixation d'une brosse dans un porte-brosse ainsi que dispositif correspondant Active EP3791751B1 (fr)

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DE102019124307.6A DE102019124307B3 (de) 2019-09-10 2019-09-10 Verfahren zum Befestigen einer Borste in einem Borstenträger sowie Vorrichtung hierfür

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DE102021102624A1 (de) * 2021-02-04 2022-08-04 M + C Schiffer Gmbh Verfahren zur Herstellung einer Bürste
DE102021118502A1 (de) * 2021-07-16 2023-01-19 Gb Boucherie Nv Verfahren und Vorrichtung zum Befestigen von Borsten in einem Borstenträger

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EP2528472B1 (fr) * 2010-01-26 2016-02-10 Trisa Holding AG Brosse à dents

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JP6920346B2 (ja) * 2016-04-26 2021-08-18 ヘーベー・ブシュリー・ナムローゼ・フェンノートシャップＧＢ Ｂｏｕｃｈｅｒｉｅ ＮＶ ブラシを製造する方法と装置

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Publication number Priority date Publication date Assignee Title
EP2528472B1 (fr) * 2010-01-26 2016-02-10 Trisa Holding AG Brosse à dents

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DE102019124307B3 (de) 2020-09-03
EP3791751A1 (fr) 2021-03-17
CN112545159A (zh) 2021-03-26

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